B&B Electronics 422LP9R Manual de usuario

422LP9R-1712-1/2

www.bb-elec.com [email protected] [email protected]

International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104

European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445

PRODUCT INFORMATION B&B ELECTRONICS

Model 422LP9R

Port-Powered RS-232 to

RS-422 Converter

The 422LP9R is a port-powered two-channel RS-232 to RS-422 converter. It converts TD and RD RS-232 lines to

balanced RS-422 signals. The unit is powered from the RS-232 handshake lines DTR and RTS. One of these

handshake lines must be asserted (high) in order to power the unit (See Table 1). The RS-422 driver is enabled when

RTS is asserted. Therefore, RTS must be asserted in order to transmit data. The RS-422 receiver is always enabled. If

DTR is always asserted and the RTS is used to control the driver, the 422LP9R can be used as a RS-232 to RS-485 4-

wire converter. To insure reception, it is recommended that DTR is asserted.

In order to maximize the amount of power available to the RS-422 driver, the RS-232 handshake lines are not looped

back (tied together). As a result the following handshake lines will appear as disasserted (low): CTS, DCD, and DSR.

Care should be taken to insure that any software being used doesn’t require any of these handshake lines be asserted.

If existing software requires any of the handshake lines to be asserted, you can loop back the required handshake lines

in your cable.

Table 1

* NOTE: Low = disasserted and High = asserted

Connections

The 422LP9R can be connected in three different type of systems: RS-422 (Figure 1), four-wire RS-485 (Figure 1), and

two-wire RS-485 (Figure 2). Regardless of the system, the 422LP9R must be connected with the proper polarity. With

no data is being sent and the driver enabled, the RS-232 line should be negative and the TD(A) should be negative with

respect to TD(B). Proper operation of any RS-422 system requires the presence of a signal return path between the

signal grounds of the equipment at each end of an interconnection. This circuit reference may be established by a third

conductor connecting the common leads of devices, or it may be provided by connections in each piece of equipment to

an earth reference. When the circuit reference is provided by a third conductor, the connection between the signal

grounds and the third conductor should contain some resistance (e.g. 100 ohms) to limit circulating currents when other

ground connections are provided for safety.

RTS State

DTR State

Functions Possible

(when port powering unit)

Low

none

Low

High

Receive

High

Low

Transmit, Receive

High

Transmit, Receive

422LP9R-1712-2/2

www.bb-elec.com [email protected] [email protected]

International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104

European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445

PRODUCT INFORMATION B&B ELECTRONICS

Biasing Resistors

The biasing resistors for the RS-422/RS-485 receiver are 4.7K Ohm resistors. These resistors are labeled R1 and R6

(See Figure 3). Refer to B&B Electronics RS-422/485 Application Note for further information on biasing.

Figure 3

Specifications

Data Rate: 115.2K Baud max.

Power: Port-Powered from RTS and DTR.

Note: If external power is required, apply power to DTR (4) and SG (5). Source must supply greater than

6VDC and current limited to 40mA

NOTE: When using an external supply, the supply should be connected only to specifically labeled power

inputs (power jack, terminal block, etc.). Connecting an external power supply to the handshake lines may

damage the unit. Contact technical support for more information on connecting an external power supply to

the handshake lines.

Table 2 - 422LP9R Pin Outs

Signal

DB-9S Pin #

Transmit Data A (-)

Transmit Data B (+)

Receive Data A (-)

Receive Data B (+)

Signal Ground

4, 6

DECLARATION OF CONFORMITY

Manufacturer’s Name: B&B Electronics Manufacturing Company

Manufacturer’s Address: P.O. Box 1040

707 Dayton Road

Ottawa, IL 61350 USA

Model Numbers: 422LP9R

Description: 9-Pin Port-Powered RS-422 Converter

Type: Light industrial ITE equipment

Application of Council Directive: 89/336/EEC

Standards: EN 55022

EN 61000-6-1

EN 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11)

Robert M. Paratore, Director of Engineering

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